function foo(a, b, c) {
  let x = [];
  if (a) {
    x.push(a);
  }
  let y = <div>{x}</div>;

  switch (b) {
    case 0: {
      x = [];
      x.push(b);
      break;
    }
    default: {
      x = [];
      x.push(c);
    }
  }
  return (
    <div>
      {y}
      {x}
    </div>
  );
}